CourantNos.H

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    #include "CourantNo.H"
 
{
    scalar UrCoNum = 0.5*gMax
    (
        fvc::surfaceSum(mag(phi1 - phi2))().internalField()/mesh.V().field()
    )*runTime.deltaTValue();
 
    Info<< "Max Ur Courant Number = " << UrCoNum << endl;
 
    CoNum = max(CoNum, UrCoNum);
}